The governing council of Norwood-Morialta High School in Adelaide says state budget cuts will reduce teaching time and curriculum choice for students.

The SA Government is to review and reduce funding for multi-campus schools, planning to save $5.8 million over four years.

The school's governing council says more than $600,000 per year would be cut from Norwood-Morialta alone.

Council chair Jeff Eglinton says staff, students and their families are worried.

"We had an undertaking from DECS (Education Department) back in 2006 to fund our dual campuses until at least he end of 2011, but we have just received information from DECS that the funding will in fact be cut from the beginning of next year," he said.

"It's interesting that, at a time when other schools in the eastern district have been promised extra funding for extra students, that the Norwood-Morialta High School, which has the most number of students ... is actually having its funding cut."

Mr Eglinton said he hoped that the SA Government would allow the school to merge its two campuses to combine staffing and better absorb cuts.

Local Liberal MP John Gardner says the cuts would remove at least four staff including a deputy principal.

"We're talking about significant hits to the ability of the school to deliver its programs," he said.

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